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Amphibious CottonĀ® by Nextec ?
http://www.nextec.com/epic_cotton.html
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Yep, that there material.
In NI you obviously can have anything from sun and 2 degrees cycling to work to pissing rain and 10 degrees on the way home... so it feels like cotton except it keeps the rain out.
I tried an endura "plastic" jacket with pit zips, but meh, still boily. I generate a lot of heat though when I exercise.
Re jackets / overheating: I commuted in a Vulpine Harrington jacket today.
Not boiled in the bag and it kept out pissing rain for the half and hour I was in it.
The fabric used is Epic Cotton, other brands use it too. Way better than Gore water proofs and other coated plastic for breathability.
No idea how it compares to Gore Windstopper for feel. It can be washed without reproofing so that's handy too.
It was 8 degrees here but with cold rain / wind. So that epic cotton stuff may be a handy option if you also are in a "4 season a day" locations :)